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1、基于RFPA數(shù)值模擬的煤層水力壓裂技術(shù)研宄王景余河南神火集團(tuán)煤業(yè)公司摘要:瓦斯災(zāi)害嚴(yán)重制約著煤炭工業(yè)的發(fā)展,為丫保障煤礦安全生產(chǎn),利用水力壓裂技術(shù)對(duì)煤層瓦斯進(jìn)行抽排。采用理論分析與RFPA數(shù)值模擬的研宂方法,研宂了不同側(cè)應(yīng)力系數(shù)對(duì)水力壓裂的拓展規(guī)律以及裂紋拓展長(zhǎng)度分析。研宄得出:當(dāng)入〈1時(shí)(垂直地應(yīng)力大于水平地應(yīng)力),裂隙的拓展方向?yàn)榇怪狈较颍划?dāng)入=1時(shí)(垂直地應(yīng)力與水平地應(yīng)力相近),裂隙的拓展方向雜亂無(wú)章;當(dāng)X>1吋(垂直地應(yīng)力小于水平地應(yīng)力),裂隙的拓展方向?yàn)樗椒较?;隨著地應(yīng)力差值的逐漸增大,起裂壓力逐漸變小,因此可以提前對(duì)壓裂鉆孔進(jìn)行預(yù)處
2、理,使得鉆孔應(yīng)力重新分布,來(lái)達(dá)到降低起裂壓力的目的。關(guān)鍵詞:RFPA數(shù)值模擬;水力壓裂;側(cè)應(yīng)力系數(shù);拓展規(guī)律;起裂壓力;作者簡(jiǎn)介:王景余(1963—),男,河南輝縣人,高級(jí)工程師,碩士,1984年畢業(yè)于焦作礦業(yè)學(xué)院,現(xiàn)從事煤炭建設(shè)與管理工作。收稿日期:2017-07-06StudyonhydraulicfracturingtechnologyofcoalseambasedonRFPAnumericalsimulationWangJingyuHenanShenhuoGroupCoalCo.,Ltd.;Abstract:Gasdisasterseve
3、relyrestrictsthedevelopmentofthecoalindustry,inordertoensurethesafeproductionofcoalmines,hydraulicfracturingtechnologywasadoptedtoextractgasfromcoalseams.ThetheoreticalanalysisandRFPAnumericalsimulationmethodwereusedtostudythelawofexpansionofhydraulicfracturingwithdifferentla
4、teralstresscoefficientsandtheanalysisofcrackpropagationlength.Thestudyfoundthat:When入<1(verticalstressisgreaterthanhorizontalstress),thedirectionofdevelopmentoffissureishorizontalvertical;When入=1(theverticalstressisclosetothehorizontalgroundstress),thedirectionoffracturedevel
5、opmentischaotic;When入〉1(verticalstressislessthanhorizontalgroundstress),thedirectionofdevelopmentoffissureishorizontal;Withthegradualincreaseofgroundstress,theinitiationpressuregraduallybecomessmaller,soitcanpre-treatmentoffracturedboreholesiscarriedoutinadvancesothatthestres
6、softheboreholeisredistributedtoachievethepurposeofreducingtheinitiationpressure.Keyword:RFPAnumericalsimulation;hydraulicfracturing;lateralstresscoefficient;extendedlaw;initiationpressure;Received:2017-07-06引用格式:王景余.基于RFPA數(shù)值模擬的煤層水力壓裂技術(shù)研宂[J].能源與環(huán)保,2017,39(11):242-245.WangJingy
7、u.StudyonhydraulicfracturingtechnologyofcoalseambasedonRFPAnumericalsimulation[J].ChinaEnergyandEnvironmentalProtection,2017,39(11):242-245.0引言煤炭是我國(guó)主體能源,瓦斯火害是目前煤礦面臨著嚴(yán)重問題,影響著我國(guó)煤炭工業(yè)的健康發(fā)展,據(jù)統(tǒng)計(jì),瓦斯災(zāi)害危害最大,事故率最高,iL可控性較差,嚴(yán)重制約煤礦的安全生產(chǎn)[1-2]。國(guó)內(nèi)外學(xué)者對(duì)水力壓裂技術(shù)己經(jīng)進(jìn)行了大量的研宄,富向m對(duì)井下點(diǎn)式水力壓裂增透技術(shù)進(jìn)行研宄,研宄了
8、剪應(yīng)力、水壓力、水流量等參數(shù)的分布與演化;翟成等ui對(duì)煤層脈動(dòng)水力壓裂卸壓增透技術(shù)進(jìn)行了研宄,研宄了煤體原生裂隙在強(qiáng)烈的脈動(dòng)水壓力作用下